CODEWITHSUNDEEP
c++linuxboostcentos
VSB
VSB

Reputation: 10415

error: `boost' has not been declared

I'm trying to use boost libraries in my C++ application. I'm trying to compile it using g++ with different options.e.g g++ -I /usr/include/boost/filesystem/ -o test.out test.cpp however it always prompt error: 'boost' has not been declared.

And here is my code:

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <boost/filesystem.hpp>
using namespace std;
int main (){
    string line;
    string fileName = "Read.txt";
    ifstream file;
    string str; 
    file.open(fileName.c_str());
    cout << "Hello, world!\n";
    vector<string>  fileLines;

    fileLines.clear();
    while (getline(file, str))
    {
        fileLines.push_back(line);
    }
    cout << "Total Line count:"<<fileLines.size()<<endl;
    fileLines.clear();
    cout << "Total Line count:"<<fileLines.size()<<endl;
    boost::filesystem::path p("/tmp/foo.txt");


    return 0;
}

I will be glad if you help me to fix this.

P.S. I'm compiling my application in Centos 4.7 and It contains Boost version 1.32 according to /usr/include/boost/version.hpp

Update:

I also commented boost instruction, but there is some problem with includes: boost/filesystem.hpp: No such file or directory.

Upvotes: 1

Views: 16266

Answers (3)

Matthew Schuchard
Matthew Schuchard

Reputation: 28854

It sounds like you have not yet installed the boost header files that you need for includes. Since you are on CentOS, you need to:

yum install boost-devel

That will place the header file you want in:

/usr/include/boost/filesystem/path.hpp

Since you are using boost::filesystem::path, you should change your #include <boost/filesystem.hpp> to #include <boost/filesystem/path.hpp>. Since -I /usr/include is passed to gcc by default, you do not need the -I /usr/include/boost/filesystem, unless you changed the include to path.hpp. However, this would be dangerous because another library may have the same header file name and then you may include the wrong header.

Upvotes: 1

VSB
VSB

Reputation: 10415

Accodring to header files in my Centos Linux, I changed

#include <boost/filesystem.hpp>

to

#include <boost/filesystem/path.hpp>

And also compiled my program with special link options: 

g++ test.cpp -o test.out  -lboost_filesystem

Upvotes: 1

Paweł Gliwny
Paweł Gliwny

Reputation: 9

You can try: g++ -std=c++11 -Os -Wall -pedantic test.cpp -lboost_system -lboost_filesystem -o test

I had the same problem

Let me know if is works

best regards,

Upvotes: 0

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